Although the entry currently says 倏不見 is unacceptable, there're plenty of 倏不見 in zh.wiktionary.org. I can also think up a similarly stuctured 忽不見. Your opinions? Dokurrat (talk) 15:31, 16 March 2018 (UTC)

@Dokurrat Clarified the note slightly. It is acceptable in Classical Chinese, but is unnatural-sounding in Modern Chinese. Wyang (talk) 00:51, 17 March 2018 (UTC)